28384289 has 2 divisors, whose sum is σ = 28384290. Its totient is φ = 28384288.

The previous prime is 28384249. The next prime is 28384297. The reversal of 28384289 is 98248382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27384289 + 1000000 = 5233^2 + 1000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28384289 is a prime.

It is not a weakly prime, because it can be changed into another prime (28384229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14192144 + 14192145.

It is an arithmetic number, because the mean of its divisors is an integer number (14192145).

Almost surely, 2^28384289 is an apocalyptic number.

It is an amenable number.

28384289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28384289 is an equidigital number, since it uses as much as digits as its factorization.

28384289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The square root of 28384289 is about 5327.6907755612. The cubic root of 28384289 is about 305.0417894903.

The spelling of 28384289 in words is "twenty-eight million, three hundred eighty-four thousand, two hundred eighty-nine".